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Temporarily transforms the drinker into another person. The drinker will take on the appearance of the person whose hair, fingernails, etc., are added to the potion. Not to be used for transforming into an animal.

Seen/Mentioned: In 1992 used by Harry and Ron to enter Slytherin common Room; Severus Snape thought Harry was stealing his ingredients to make a polyjuice potion; Used multiple times in 1997 and 1998.